Magnetized orbits around a Kerr black hole

Details Magnetized orbits around a Kerr black hole Magnetized orbits around a Kerr black hole

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21..961d&link_type=abstract

Classical and Quantum Gravity, Volume 21, Issue 4, pp. 961-973 (2004).

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

We study the motion of magnetized particles near a rotating black hole. The main result is that the spacetime curvature and electromagnetic field conspire to allow for the existence, inside the ergosphere, of stable circular orbits occupied by particles with negative total energy and angular momentum. Since these particles would never populate stable orbits were they not magnetized, a large binding energy is required to let them exist. A simple model of a magnetized belt in the ergosphere of a massive black hole with a strong magnetic field, shows that it can store a binding energy as high as 1054 erg, an amount comparable with the energy detected in gamma ray bursts. Besides the above astrophysical considerations, this paper contains a formal deduction, from an appropriate Hamiltonian, of the equations of motion of a neutral and magnetized fluid made of spinless dust particles interacting with a magnetic field. This analysis does not appear to have been done before.

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